Recording calculating-machine.



Patented Aug.A 30, 1910.

9 SHEETS-SHEET 1.

we 4%/ jf/75%# .'r. MALLMAN. RECORDING UALUULATING MACHINE.

APPLICATION FILED JULY 22, 1909. 968,674.

J. MALLMAN.

RECORDING CALGULATING MACHINE. APPLICATIONV FILED JULY 22, 1909. Y968,674, Patented Aug. 30, 19,10.

M m U e h @N w u v mm m u a y Patented Aug. 30, 1910. `9 sHBETs-snBET s.

I. .MALLMAN.

RECORDING GALCULATING MACHINE. APPLIOATION. FILED JUILY 22, 1909.968,674.

@www

J. MALLMAN.

BEOBDNG oAL'cULATlNG MAGHINE.

APPLICATION PILEDJ'ULY 22, 1909.

Patented Aug. 30, 1910 f 9 SHEETS-811151114.

, J. MALLMAN.

RECORDING GALGULATING MAOHINE.

APPLIUATINIILED JULY 22, 1909.

Patented Aug. 30, 1910.

9 SHEETS-SHEET 5.

J. MALLMALL EEUORDING OALGULATING MAGHINE.

APPLIUATION 111mm JULY 2:2, 1909.

Patented Aug. 30, 1910.

9 SHEETS-SHEET 6.

' l@www1/Vat) J. MALLMAN. RECORDING GALGULATING MACHINE.

APPLIOATIDF FILED JULY 22, 1909.

J. MALLMN.

RECORDING GALGULATING MACHINE.

APPLIOATION FILED-JULY z2. 1909. 1 968,674. Patented Aug. 30, 1910.

9 SHEETS-SHEET E.

J. MALLMAN.

RBGORDING GALGULATING MAUHINE.

APPLIUATION FILED JULY 22, 1909. l 968,674. Patented Aug. 30, 1910.

" 9 SHEETS-SHEET 9.

rise

with, such mechanism being generally em,

l To provide adding-wheels and a simple y of adding-keys. 40

. key-board is dispensed with. The mechanv lock and trip. To

vwith the adding-keys, whereby the `oscilla- UNITED sTATEs PATENToEEIcE.

JAMES MALLMAN, or sHEBoYeAN, wisconsin]A RECORDING- CALCULATING-MACHINE.

Specication of Letters Patent. Patented lilllg.` 30, 1910..

- Application filed J'uly 22, 1909. Serial No. 508,881.

To all whom 'it may concern:

Be it known that I, JAMES MALLMAN, .a citizen of the United States, andresident of Sheboygan, in the county of Sheboygan and State of,lVisc'onsin, have invented certain new and useful Improvementsin-Recording Calculating-Machines; and I do hereby declare that thefollowing is a full, clear, and exact description thereof.

The general object of my invention is to provide a simple, economical7and effective recording calculator, having a. single series of tenadding-keys and connected type-bars operating in conjunction with asingle series of tabulator keys corresponding in number to theadding-wheels employed in the register mechanism, whereby multiplicityofthe ism is also materially simplified by reason' of individualprinting of each figure of an item separately similar to the printingoperation of a type-writing machine, and thus the complicated mechanismnecessary in assembling the various figures of 4an item prior to aprinting-operation is dispensed ployed in addingmachines of therecording type. The machine is further simplified, due to the fact thatin printing totals, the same are read from the visible registerwheelsand printed in a similar manner as that just mentioned with reference toan item, the register-wheels being returned to zero incidental to thetotal printing.

In brief the specific objects are as follows:

mechanism for operating same, the operating-mechanism being actuated bythe series To -provide a carrier or transfer mechanism for saidvadding-wheels. To provide a total-lever with total-lever provide anadding-wheel actuating-mechanism in the form of an*y osy cillatorytoothed sector, the sector being capa le of a horizontal step-by-stepmovement -from one adding-wheel to the other under control of anescapement-ronnection. To provide `a graduated plate in connection torymovement of the toothed sector is controlled'with relation to -theadding-wheels. To provide a universal-bar arranged to be actuated by theadding-keys, which universal-bar actuates the escapement controllinghorizontal movement of the toothed sector. To provide a ribbon-shiftmechanism and type-barA lock-and-release mechanism. Io providemeans inconnection with the totallever for shifting the graduated plate during atotaling-operation, whereby movement of the adding-wheels is controlled.To provide an adding-key locking-mechanism, whereby only one key can bedepressed .at a time. To provide an individual key for actuating theescapeinent -mecl1anism, and an adding-key lock-arranged to be actuatedby the horizontal movement of the' toothed sector. To provide auniversalswing bar in operative-connection with the tabulator-keys andmechanism connected therewith ,for loading the adding-wheel transfer orcarrier-mechanism. To provide a roller-platen and means for actuatingthe same forA line-spacing, in connection withl the universal-swing barof theI tabulatorkeys. To provide a graduated plate adapted to beactuated by t-he tabulator-keys, the plate being linked to the mechanismcon-l trolling the horizontal movement of the adding-wheel toothedsector, whereby the same is moved in one direction ste -bystep andalined with any one of the series of vadding-wheels. To provide acarrler upon which the roller-platen) and its paper carriage areadjustably mounted, the carrier being connected to the segmentalrack-actuating mechanism, whereby said carriage is moved longitudinallywith each horizontal movement of the toothed sector to effectautomaticspacin between a row of figures collectively indicating an item. Toprovide a series of plunger-stops in connection with the tabulator-keys,which stops operate in conjunction with a graduated stop-plate that issecured to the carrier to preventoverthrow of t-he latter and alsosecurevertical alinement of the toothed sectorV and adding-wheels. To providemeans for adjusting and locking the paper-carriage and its platenlongitudinally of the carrier,

whereby column-adjustment of the paper is j i had. To provide ay sprin-gconnection be' tween the type-bars and ad ing-keys,where bysaid`t-ype-bars are actuated by a fixed spring-pressure to print whenreleased. To provide atwo-colored ribbon and means for feeding theribbon and reversing said feed. To provide means in connection with thetotal-lever and ribbon, whereby the latter is shifted to print in adistinctive color for a total-operation. To provide a pointer inconnection with the toothed sector, whereby the adainglvheei to beaci-,ed up@ is infn ylongitudinal sectional view of a recordingcalculator embodying the features of my 1nvention, the section beingindicated by line 1-1 of Fig. 4; Fig. 2 ailongitudinal section view ofthe same, as indicated byline 2-2 of Fig. 4; Fig. 3, alongitudinalsectionai view of the machine looking in the opposite directionkrom thatshown in Fig. 2, the section being indicated yby line 3--3 of Fig. 4.Fig. 4, a plan sectional view of the machine, the section beingindicated by line 4-4 of 1; Fig. 5, a cross-section of the machine, asindicated by line 5-5 of Fig. 1; Fig. 6, a cross-section of the same, asindicated by line 6-6 of Fig. 1; Fig. 7 a rear view of the machine-frameshowing the paper-carriage mechanism with parts broken away and parts insection to better illus y, trate certain structural features; Fig. 8, a

detail plan view of the operating toothed sector of the adding-wheelsand its connected lstep by step actuating mechanism,

the section being indicated by line8-8 ofv Fig. 1; Fig. 9, a detailtransverse section of the same, as indicatedfby line 9-9 of Fig. 1; Fig.10, a sectional view in diagram of the addingkey stops and oscillatoryframe which carries the toothed sector of the adding-wheels, the diagrambeing shown to clearly illustrate the two series of stops controllingthe movement of said frame during a total-operation or adding-operation;Fig. 11, a detail elevation` ot a" portionof the mechanism provided forlocking the addingkeys afterone of the series' have been depressed; Fig.12, a detail sectionalview of one of the adding-wheels and itscarryingmechanism, the section being indicated by line 12-12 of Fig.,14;Fig. 13, is a similar view of one of the adding-wheels and itscarying-mechanism, looking from the Areverse side; Fig. 14, al detailsectional plan view of a portion of the adding-wheel mechanism, asindicated by line 14-14 of Fig. 13, and Fig. 15, a sectional view of`the same, as indicated by line 15-15 of Fig. 13, one of theadding-wheels being shown in elevation.

Referrin by characters to the drawings,

' 1 and 2 in icate standards, which, together with a series ofcross-braces constitute the machine-frame, the 'front cross-brace 3being arranged to support a series of brackets 4 secured thereto.through apertures in the series of brackets, the shaft constituting abearing for a series of adding-wheels 6 loosely mounted thereon,

A fixed shaft 5 passes eight of which adding-wheels are shownl in theseries, and as so provided the machine is capable -of registering andrecording amounts up to 900,000.00. The rst two adding-wheels of theseries from right to left register amounts up to .99, the thirdA wheelregistering dollars, and so on through the series. The face of eachadding-wheel is providedv with the usual cipher and numerals from 1 to 9inclusive, being spaced equal distances apart circumferentially of theadding-wheel which wheel carries a tentoothed pinion 7 that extends fromits hub and is adapted to mesh Awith a twelvetoothedtransmission-,pinion 8, which latter pinion is loosely mounted upon astud carried by the adjacent bracket 4. The transmission-pinion 8 ofeach of the4 addingwheel sections is so disposed as to be engaged by anoscillatory toothed sector 9,

which sector is also capable of a longitudinal step-by-step movement,whereby each of the adding-wheel transmission pinions 8 may besuccessively engaged when the sector is vertically oscillated, saidsector being controlled in its longitudinal movement by a motor-springin opposition to an escapement-meehanism to be hereinafter described.Mounted upon the brackets 4, which brackets each carry a completeadding-section, is' a spring-controlled clickpawl 10 that engages thepinion 7 and serves to prevent ,back-lash of the adding-wheel when theysame is actuated by the toothed sector 9. A feed-pawl 11 is pivotedtothe upper end of a bell-crank lever 12, the bellcrank being fuicrumedvto the bracket and is provided with aloading-spring 13 connecting thesame and said bracket. The nose of the eed-pawl 11 is normally. clear ofthe p inion 7 lwhich pinion it engages and moves the distance of onetooth, whereby a carrying-operation from the adding-wheel of lower orderis transmitted to the next adding-'wheel of higher order, the details ofwhich `carrying-mechanism are best shown in Figs. 12 and 13 of thedrawings.

Figs. 12 and 13, illustrate the carrying- `7 Vand rests upon a finger 14ofthe bellcrank 12. The finger 14 alsocarries a stud 15 that extendsthrough a slot 16 in the adjacentbracket 4, the stud being ,normallyengaged by a locking-dog 17, which dog constitutes allportion of aspring-controlled trip-latch 18y that is pivoted to said bracket andextends in the' path of travel of a peripheral tooth 19 carried by theaddingthat the carrying-mechanism controlled by this trip-latch operatesupon the addingwheel section preceding.

When the adding-wheels are at Zero, the ciphers are alined so as to beclearly visible wheel of lower order, it being understood to theoperator and the tooth 19 of each adding-Wheel in this position is justin ad- Vance of the nose of the trip-latch 18. Thus there will be nomovement of the trip-latch until its particular adding-wheel has movednine spaces, in the direction indicated by the arrow, after which timesaid tooth 18 lifts the trip-latch and causes disengagement of thelocking-dog 17 with the stud 15 of the bell-crank 1,2. When this releasetakes place, due to the locking-dog, the loading-spring 13 being freetoyact causes forward movement of the bell-crank, whereby thefeeding-pawl 11 engages the pinion 7 and'thus moves the adding-wheel ofhigher order, the dist-ance of one space to eli'ect a registration ofthe proper amount. At the instant of release ofthe carrying-mechanism,by the trip-latch 18, its locking-dog 17 will engage the upper face ofthe stud 15 and thus prevent rengagement of these parts, there being altail 2O extending from the feed-pawl for engagement with a pin 21,whereby said feed-pawl Vwhen moved forward to accomplish acarrying-operation is held in meshing-engagement with the pinion 7,locking the Awheel to prevent overcarrying from momentum. After thecarrying-mechanism has been tripped, it is re-loaded whenever atabulator-key is depressed, by means of a rocker-bar 22, that extendsunder arms 23 of the bell-cranks 12,

which rocker-bar is fulcrumed to ears projecting from the cross-brace 3and is arranged to be oscillated by mechanism to be hereinafterdescribed. t

The toothed sector 9 is provided with ten teeth, corresponding in numberto the teeth of the pinions 7 of the adding-sections, the

`first tooth of the sector, as Shown in Fig. 1,

being normally below the transmission pinion 8 the distance of the spaceofabout one tooth, and so disposed relative to said transmission pinionas to engage a tooth of the latter when vsaid section'is oscillated thedistance of one space. The sector 9 extends from and forms part of acarriage 24, which is provided with rollers 25 that engaged upl per andlower horizontally disposed rails 26, 27, respectlvely, of al1oscillatory carriage- 'frame, the lower rail 27 of the carriageframebeing mounted in bearin s of the standards 1 and 2. The carriageamerails 26 and 27 are connected by side-bars 28 having studs 29 extendingtherefrom for engagement with links 30, the opposite ends of whlch linksbeing supported by studs 31 that extend from hangersv 32 pivoted tosaidframe standards 1- Vand 2. EThe rollers 25 of the carriage 24 areprovided with concavoconvex faces foi` engagement with correspondingfaces of their respective rails, whereby lateral play of said carriagewith relation to its frame is prevented, there belng apertured ears 33extending from the lower portion of the carriage surrounding the lowerrail 27, whereby said carriage is further supported in its place.

From the foregoing description, it will be seen that the toothed sectorv9 may be freely oscillated to engage the transmission pinions 8 of theadding-sections and that the carriage 24 is free to travel back andforth within its frame parallel with the transmission pinions, Iwherebyany one of the same are alined with said toothed sector. n

A Spanner 34 engages the lower rail 27 of the .carriage-frame, this railbeing circular in cross-section to permit oscillation thereof withrelation to the spannelgithe engagingend of which Spanner overlaps theears 33 of the carriage. T he Spanner is provided with a pivoted rod 35having telescopic-engagement with a tubular arm 36, which arm ispivoted-to an ear 37 that extends from a rear cross-rail 38 secured tothe frame-standards of the machine. A coil-spring 39 connects thetubular arm 36 with the frame-standard 1, as best shown in Figs. 4 and 8of the drawings, the said spring constituting a motor that exerts itsforce to move the tubular arm and carriage 2-1 from left to right ortoward the adding-sections of lower order. The tubular arm 36 ismanually operated in opposition to its motive power of the s ring, bymeans of any one of a series of tabu atorkey levers 40, which correspondin number Ato the adding-sections, bein arbitrarily designated by colorsdisplay upon push-buttons carried thereby, it being 'understood that theadding-sections are correspondingly designated, thus the first two keysfrom right to left designate cents and tens of cents respectively; thethird key dollars, and so on throughout the series. The connectionbetween the tabulator key levers and the toothed sector 9 is so arrangedthat if the third or dollars key should be depressed, said-toothedsector will be moved from rightto left to a position alined with thetransmission pinion 8 of the dollars adding-section, vorif the hundreddollars key is depressed a greater movement 'of the sector is obtainedin the same direction whereby it is brought to an alined position withthe huny dred dollars adding-section, and so on. j lEach key-lever 40and its connected mechanism is arbitrarily7 arranged to move the.

.carriage 2-tfrom right to lefti at 'different fixed distances. Thismovement is accomplished by means of a gage-plate 41, which is suspendedfrom a rod atlasecured in the side standards of the frame, theA rod alsoserving as a fulcrum for the series of tabulator-key levers 40. Thesetabulator key levers have depending arms 42 for engagement with a faceof the gage-plate 41, which face is notched to form-a series of steps,each step being spaced ata different distance from the contact-faces ofthe arms -12 of the tabulator keys. Thus from right to left of the l iusmachine, for example, the first tabulator arm would be the distance ofseven spaces from the working-face of the gage-plate, the next arm sixspaces and 4so on throughout. By this construction it will be seen thatall ,of the tabulator keys havethe same stroke, but each key imparts agreater or less movement to the gage-plate. While I have shown thegage-plate working-face as being stepped,it

is obvious that in some instances it may be Figs. 3 and 4 of thedrawings, the gage-plate 41 is linked to a bell-crank l44, whichbellcrank in turn is connected to a lever 45, through the medium of apair of links 46, 46', the intermediate endsof these links be- Yingpivoted to an ear 47 that is connected to a slide-bar 48, which barcomprises one member of a reciprocative carrier to be hereinafterdescribed. The lever and bellcrank 44 are each fulcrumed to extensionsof a cross-brace 49 secured to the frame-stand` ards 1 and 2, thetubular arm 36 being con# nected to said lever 45, by means of a link50. Thus it will be seen that movement is imparted to the gage-platethrough the arms 42 of the tabulator key-levers, which movement will betransmitted to said tubular arm 36 by means of the several levers andlink connections just described.

The slide-bar 48, which constitutes one member ofa reciprocative carrieris connected by standards 51 to an upper slide-bar 52,',

the standards also forming supports for a bed 53, which bed is providedwith longitudinal ways 54, 54', for the reception of a base-plate 55 ofa paper-carriage "frame, This frame is composed of end-brackets 56 whichextend from the base-plate and a rear brace-bar 57 connecting saidend-brackets. The usual roller-platen 58 is mounted in bearings providedin t-he end-brackets 56, therembeing a paper-shield 59 carried by thepaper-carriage together with spring controlled paper-gripping rolls 60,61, and a gage-bar- 62, all of which features constitute no parts of myinvention. The rear-gripping-roll G0 has its bearings in leaf-springs 63which are secured to the rear face of the paper-shield 59.` Projectingunder the leafsprings are fiattenedextensions 64 of a rod 65, which rodis trunnioned in earsextending from the .paper-shield and hasend-bearings in the brackets 56 A of the carriage-frame, a section 66 ofthe rod 65being looped about the gripping-roll 60. Secured to thesection 66 of the rod aforesaid is a finger 67, which finger is arrangedto engage any one of a series of notches 68 formed in a. rib extendingfrom the carrier-way 54. 'One end of the rod G5 is provided with a`hand-grip 69, by means of which grip said rod is rocked in its bearing,thereby causing the flattened end 64 thereof to liftthe gripping-roller60 from its contact with the surface of the rollerplaten. This movementalso causes the iinger 67 to disengage from its seat inthe notch 68,into which it had previously been adjusted. Thus the paper-carriageproper and the platen may be longitudinally adjusted and locked relativeto the carrier, whereby any one of a series of columns, indicated upona' wide sheet of paper carried by the platen may be moved to theprinting-point of the machine. line-spacing is attained through aratchetwheel 70 fast on the platen-roller shaft, the ratchet-wheelbeingengaged by a pull-pawl 71 thatis carried by an arm of a bail 72. F eedof the platen for line-spacing is accomplished through the medium of aspring 73 which is carried by the brace-bar 57, one end of the springbeing opposed to the bai'l 72, which bail extends from end to end of andrearward of the carriage. The bail 72 is lifted in opposition to itsspring 73, by a plunger 74l suitably supported directly under said bail,the plunger being connected to a bell-crank 75 which is linked to an arm76 of a universal-swinging bar 77, the bar being suspended from the rod41a, upon Whichrod are mounted the tabulating-key levers. A rod 78 ofthe swing-bar extends across the width of the machine directly forwardof the tabulator-arms 42, whereby motion is imparted to said swing-barwhen any one of Rotation of the platen forv the tabulator keys isdepressed, and thus it will be seen, by referring to F ig. 1, thatwithach depression of a tabulator-key, m0- tion is transmitted to thebail 72 and. from thence to the ratchet-Wheel, whereby linespacing ofthe platen-roller is had upon the recovery of'fthe depressedtabulator-key to its normal position.

12e-loading of any or all of the addingsections must be accomplishedsimultaneous "with the depression of a tabulator-ke-y. To

attain this result, the rocker-bar 22 is provided with an arm 22, whicharm `has secured thereto the slotted end of' a loadingbar 79, and theopposite end of this bar is connected to one end of a lever S() that isfulcrumed 'to the frame-standard 1 of the machine, the long arm of whichlever is linked to the universal swing-bar 77, whereby movement of thelatter causes the rockerbar 22 to reset or load any adding-section,

which had previously been actuated, this movement being due to thrust ofthe loading-bar imparting action to the arm 22a.

Referring to Fig. 8 of the drawings, the toothed sector 9 and itsconnected parts'are shown in the position assumed when said sector hasmoved from left to right the entire distance ofnine spaces, having cometo rest the distance of one space rearward of the last or centsadding-section. The mechanism is drawn to the above `described positionby the motor-spring 39 operating in opposition to an escapement-lever81, which lever is pivota-lly mounted upon an extension 82 of across-brace 83 of the machine-frame. The escapement-lever 81 carries aspringfinger 81, having a head 85 with an abrupt engaging-face withwhich a series of spurteeth 8T are arranged to Contact, the spurteeth(nine in number) being extended from a shoe 88 that forms part of thetubular arm "36, said teeth being circumferentially disposed withrelation to the pivotal point of the tubular ar1n.` The head of thespringfinger 8-1- is also provided with abevel-face, whereby thespur-teeth 8T may act to depress and pass over the spring-finger whenthe tubular arm 36 is moved in opposition to its motive force. Theescapement-lever is also provided with a right-angle tooth 81a in rigidconnection therewith, the Workingface of which tooth is disposed to oneside oi the spring-linger engaging-face and a distance in advance of thesame, equal to half the distance traveled by the toothed sector in itsstep-by-step movement. The extension 82l upon which the escapementleveris mounted is provided with suitable stops, whereby movement of 1saidescapement-lever is limited in either direction.

From the rforegoing it will be understoodl that if the escapement bemoved so that the engaging-face 'of I the spring-finger 84; is shiftedfrom the path of travel of any one of the spur-teeth 87, the tooth soreleased will move forward until checked by the rigid tooth 81a of theescapement lever, against which latter tooth the tooth 87 will seat. Areverse movement ofpthe escapement causes the confined spur-tooth 87. tobe freed from the escapement rigid tooth 81a, and the tubular arm isthereby permitted t0 complete a movement of one space, the succeedingspur-tooth 87 of the series in the meantime having been caught y by theengaging-face of the spring-inger 84.

Assuming that the operator wishes to print an item with eight figures,which is the capacity of lthe machine as shown, the amount forillustration being 900,000.05. The parts being in the position as shownin Fig. 8, the toothed sector 9 would consequently have to be shiftedfrom the position shown, from right to left the entire distance of itsmovement of nine spaces. This is Aaccomplished by depressing the lasttabulat'or-key from right to left of the series,

Which'action causes 'the gage-plate 41 to link-connection with thetubular arm 36, the

`latter will be movedto the desired'point in opposition to thecoil-spring 39. In this movement, the spring-linger 84 of theescapement-lever was depressed with each enga ement of the series ofspur-teeth 87 carried by said tubular arm.v The toothed sector 9 willnow assume a position similar to that shown in Fig. 1, with relation tothe addingsection of highest order, the section being alined with thetransmission pinion 8 of said section. In order to print the numeral 9,the sector together with its carriage 24, must be oscillated about thecarriage-frame axis. This movement is accomplished through motionimparted to the links 30, which links are connected to the carriage 24,by means of the studs 29, said links being also rigidly connected by agage-plate 90, which gage-plate is actuated by arms 91 of a series often adding-key levers 92, as best shown in Figs. l and et of thedrawings.

As best shown in Figs. 1 and 4, the .adding-key gage-plate is formedwith a Series of graduated notches 93, the depth of which notches aresuccessively increased from the third key from right to left of themachine.

The first key of the series is the cipher-key,

,its arm 91, that when said cipher-key is actuated, the ga ge-plate willbe moved the distance of only one space. This movementl of thegage-plate will impart no movement to any of the adding-sections,y owingto the distancebf one space between the transmission pinion Sand normalposition of the first tooth of sector 9. The next key, which is designedto print and register the numeral 9, has its arm 91directly in contactwith the gage-plate 90. The toothed sector 9, as previously described,is now alined with the last adding-section mechanism, and if the nineadding-key is depressed the gageplate 90 will be moved its full distancecausing the toothed sector and its carriage to rotate about thecarria-geaxis and thereby 'describe its full oscillatorymotion, in deitems may beread and that all register-secl tions were at'zero at the time of theoperation. When the ninth` key was so depressed,

thel carriage 24 was checked in its oscillatory movement by contactingwith one fof a pair of fixed stops 94, but the remaining keys of theseries are provided with stops 95 depending from the several keys and sodisposed Withrelation to the carriage 24 that the latter will be checkedat the desired intermediate point of its oscillatory movement relativeto ythe depressed key,`whereby the proper movement of theregister-sections is insured'. These stops are clearly shown in Figs. 1and 10. When the ninth key was depressed, its arm 91 also engaged aspringcontrolled universal bar 96, which bar is provided with verticallydisposed arms 97. The arms 97 of the bar are' suspended from a fixed rod98, the rod forming a fulcrumlpoint for the series of adding-keys, andis secured to the standards 1 and 2. After the toothed sector has actedupon the registersection, due to oscillation ofthe carriage togetherwith the carriage-frame, said frame and carriage are returned to theirnormal position, by means. of a coil-spring 24, which spring isconnected to an arm 24b that is secured to the lower rail 27 of thecarriage and side standard 1, as best shown in Fig.`2,

the carriage being one of the stops 94.

As clearly shown in'F ig. 3 of the drawchecked in its return by ings,one of the vertically disposed arms 97 N order. This last horizontalmovement is acof the universalbar carries'a tappet'finger 99', whichfinger through the movement of the bar 96 engages the adjacent end ofthe escapement lever 81. Thus after the sector has described its fullmovement, the tappettabulator-keys. U on the recovery of the ninth keyprevious y described as being depressed, a spur 102 that is carried byone of the links 30, will act upon the escapement-lever and therebycause the tubular arm 36, together with the sector,to complete-themovement of one space. Thus it will be seen that the toothed sector 9moves upward on its workin -stroke, then forward from left to rightonealf of a space, whereby it is disengaged` from `the transmissionpinion 8; Then said sector 'willdrop vertically to its normal positionand thereafter complete its one-space forward movement so as to bebrought into alinement with the preceding adding-section of lower 'esame,ment mechanism however would be operated with each depression of saidcipher-key and the sector 9 would move step-by-step in a horizontaldirection a distance of six spaces, bringing said sector in alinementunder the transmission pinion 8 ofthe cents addingsection. The fifthadding-key would next be depressed, causing the cents register-sectionto indicate 5 cents, this operation being similar to 'that ldescribed inconnection with the nine adding-key,l except that in this last instancethe stop 95 of the fifth 'addingkey would limit the oscillatory movement-of the toothed sector 9, the stop being depressed into the path oftravel of the upper `rail 26 of t-he carriage frame 24. Inwthis lastoperation, the .sector and its carriage will have moved one spaceforward of the cents adding-'section and reached the limit of itsmovement kfrom left. to right, as shown in Fig. 8, at which time it "isdesirable to lock the adding-keys. This locking-movement isaccolnplished by means of a lug 103, as shown in Figs. 1 and 9, the lugbeing carried bythe Spanner 34, which Spanner serves to imparthorizontal movement to the sector carriage. This lug 103 engages abell-crank 104, which bell-crank is fulcrumed to the side standard 1 andis in link-connection with a spring-controlledo locking-lever 105',which lever is fulcrumed between ears extending from the crossbrace 83.Then the movementpreviously described in connection with the fiveadding-key takes place, the lug 103 of the Spanner engages and rocks thebell-crank 104 causing a corresponding rock of the locking-lever 105,one arm of which lockinglever 1s thereby brought into thepath of travelof a depending finger 106 that extends froml the universal-bar arm 97,and thus it will be seen that all of theaddingkeys areL locked againstdepression, due to their contact with the universal-bar 96, which bar isnow ylocked-by the finger 106. Should the highest figure of the nextitem to be re istered be in the hundreds, it is obvious t at thehundreds-column tabulatorkey must be depressed, which movement causesthe sector to travel from left to right vand be arrested alinement withthe hundreds adding-section pinion, the operator thereafter depressesthe adding-key corresponding to the amount desired to be .registered.Thus the toothed sector 9 may be moved from a sector of lower order toany sector of higher denominationLby actuating the properly designatedtabulator-key.

Should the operator inadvertently depress bearing 108.

' adding-keys.

the tabulator-key in advance of the key required, a pointer 9a whichextends from the sector 'Scarriage will indicate the error, due to itsalinement with the adding-section upon which said sector will next act.In case of such an error the sector'9 may be returned to its correctposition by means of a spring-controlled spacing-key 107, whichspacing-key, as shown in Fig; 3, is loosely mounted in a bearing 108carried by the frame-standard, the stem of the key being arranged toengage a foot 109 that eX- tends from the vertical arm 97 of the'universal-bar 96. Owing to the provision of lthe spacing-key, it-isapparent that the universal-bar and its vertical arms may be swung uponthe bearing-rod 98, by a depression'of said key, whereby thetappetlinger 99 will actuate the eScapement-mechanism in a similarmanner to that previously described in connection with the This movementis limited to a distance equal to the movement imparted to theuniversal-bar, the movement being limited by means of a stop-pin 110,which pin projects from the releasing-key stem and is arranged to engagethe head of the In order to prevent overthrow of the toothed sector 9,When actuated ina horizontal direct-ion by means of the tabulatorkeysand thereby insure alinement of the same with the adding-sections, eachtabulating-key is provided with a horizontally disposed plunger-bar111,y the bars being pivoted tothe arms 42 of the tabulator-key levers.The opposite ends of these plunger bars 111 extend through and areguided in slots in the cross-brace 49, the slots and bars supportedtherein being spaced at equal distances-apart'transversely of themachine and are each-disposed upon a different horizontal plane.. Theends of the plunger-bars so arranged serve as stops, acting in con-ljunction with a stop-plate 112, which stopplate is provided with aseries of vertically disposed stepped faces 113 upon differenthorizontal planes, the faces corresponding in number to the plunger-barsagainst which they are arranged to. contact, when the plunger-barcorresponding to a particular stepped face 113 has been forced into thepath thereof by means of a.tabulatorkey movement. Thus for instance, asshown in E ig. 5, the cents plunger-bar and` corresponding stepped face'of the stop-plate @are so arranged. as to be normally set at a distanceof a single space apart, the next or tens of cents its stepped face, thethird or dollars plunger-bar three spaces, and so on throughout,`thelast plunger-bar being eight spaces distanced from the opposing steppedface 113 of said stop-plate, in which position the `toothed sector 9 isat the extreme of its movement from left to right of the machine, asshown in Fig. 8. The stop-plate 112 is Secured to and moves with theslide-bar 48 of the carrier, being extended from and forming a part ofthe ear 47.V Thus if the last tabulator-key be depressed, the toothedsector 9 swings to a horizontal position, so as to engage the lastadding-section, and the stepped face 113 of the stopplate 112 willengage the end of the plunger-bar connected to said tabulator-,arm andthereby check the said toothed sector and its connected mechanismagainst momentum. In connection with this movement it will be observedthat when the tubular arm 36 is swung from right to left, movement ofthe stop-plate 112 is in the opposite direction or from left to right,due to the linkcon nection between the tubular arm 36 and ear 47 of theslide-bar 48. The slide-bar 48 consequently moves the carrier in thesame direction a proportionate distance corresponding to the movement ofthe toothed sector 9 so that if, as previously stated, the last orhundred-thousand tabulator-key being actuated, the carrier willv move adistance of eight-spaces, being checked by the stop-plate 112. Thismovement of the carrier is 'for the purpose of automatic adjustment ofthe paper and platen relative to the printingpoint of the machine,whereby the figure to be printed is brought .into the proper relat-iveposition denominating its numerical value relative to other figures inthe item.

.The lower slide-bar of the carriage is supported between the. sectionsof the rear cross-rail 38, the upper-slide-bar'being supported by across-rail 38a. Each slide-bar is arranged to travel upon suitableantifriction ball-.bearings seated in said cross-rail sections, therebeing a coil-spring 114 connecting said slide-. bar and an ear 115 ofthe cross-rail 38 as shown in Fig. 7, this springl being provided tooperate in conjunction with the motor-spring 39 to feed the carrier fromright to left when the tubular arm 36 is released by theescapement-mechanism.

The printing or recording mechanism of the machine consists of'a seriesof ten typebars 116, which type-bars are fulcrumed in a sector bracket117 that is secured to the sidestandards 1 and 2, the fulcrum-points ofthe type-bars being arranged to describe a segment of a circle relativeto the printingpoint upon the roller-platen, this construction beingsimilar in -principle to that 1n general use in forms of visibletype-Writers.

plunger-bar two spaces from i Arms 118 depend from the type-bars and areeach connected, by a coil-spring 119, to arms 120 of the adding-keylevers, there being rods 121 also connecting the type-bar arms 118 andarms 120 of the adding-keys.

The ends of the rods 121 which connectthe adding-key arms are slotted assho'wmwhich slots are engaged by pins thatproject from saidtype-bararms. The coil-springs, for convenience, are shown connected to the rods121 adjacent to the arms 118 of the type-bars, but said springs may beconnates in the path of travel of the universal bar 96, by means ofwhich bar said thrustf rod is actuated. A standard 128 is secured "tothe sector-bracket 117, the standard extending to a point slightlybelowr l-the printing-point of the roller platen, and is providedat itsupper end with forked eXten` sions` 129, which extensions serve asguides for the type-bars.

.y A.' reciprocating ribbon-guide 130 is mounted uponthe standard 128having pairs of staggered lingers 131 between which the ribbon 133isguided, the outer `set of said fingers being provided with inturnedends 132 which serve to hold the ribbon 133 in position. Theribbon-guide 130 is linked to a lever 134, which lever is fulcrumed toan ear that extends from the sector bracket 117. As best shown in Figs.2 and 5, theA outer end of the lever 134 carries a link 135, the lowerend of which link is slotted for the reception of a stud that is carriedby a bell-crank 136, the stud being connected to the link by means of acoil-spring 137, which Spring serves to seat the stud in the upper c endof the link-slot, whereby a yielding-connection between said link andbell-crank` is had. The bell-crank is pivoted to an eXtension of one ofthe ears 124 that depend from the sector bracket, one arm "of saidbellcrank being connected to` the universal-bar 96,by means of a rod138. is longitudinally divided into two colors, the upper color ofwhich` is ydesigned to -be utilized i'nfprinting items and the lowercolor for printing totals, `the ribbon being normally held elow theprinting-point, where.- by the last item upon the platen.

printed is visibly displayed The operation of the printing-mechanismvThe ribbon 133" just y'described is as follows: When an adding-key isdepressed, its arm V120 distends the coil-spring 119 attached thereto,the pin carried by said arm having `free movement in the slotted end ofits rod 121 to permit distention of said spring. Just prior tocoInpletion of the depressed movement of the adding-key, theuniversal-bar 96 engages the thrust-rod 126 causing the gate 118a toswing down and releasev the arm 118 of the depressed type-bar, thecoil-spring of which arm is now under tension. Thus contraction `of thecoil-spring causes this particular typebar to swing upward and produce aprinting-impact against the platen-roller, the pressure of the blowbeing entirely controlled by the spring-connection before mentioned, therod 121 serving only to insure positive and speedy return of thetype-bar to its normal position of rest. By providing spring-actuatedtype-bars to eect a print-v ing-operation, it will be,y observed that auniform ,impact is given to said type-bars and that the manualdepression of a key only sets the springs which are thereafter releasedby meansof the swinging-gate 118a so as to clear the type-bar arms 118under spring-tension whereby printing is eii'ected. In 4describing thisaction, all other type-bars are held in their normal position of rest bytheir rods 121, and thus the printing will be uniform and not dependentupon the touch'v of the operator. "With the initial depression of anadding key, the bell-crank V137 is actuatedthrough its rod 138,l thismovement causing the lever 134, through its connectionto saidbell-crank, to lift the ribbon-guide 130, the movement being s0 timedthat the upper color of the ribbon is brought.

to the printing-point prior to an impact of *he type-bar. The limit ofJthe upward movement of the ribbon is controlled by an oscillatory bar139, which b-ar is provided `with a stop-face 140, that is normallyengaged by the end of lever 134 to thus limit the upward movement of theribbon-carrier,

A and although the lever movement is checked by ythe stop-face 140 ofthe bar, the bellcrank 137 has a further movement, which is compensatedfor by means of the coil-spring 119 and the slotted connection betweensaid bell-crank and link. Y For obtaining a total, the lower color ofthe ribbon is utilized, and hence in a totaling-operation the ribbonmust be elevated a greater distance than previously described inconnection with itemprinting- In this case the oscillating-bar 139 isshifted by mechanism to be hereinafter described, so as to bring asecond stopface 141 under the end of lever 134, this latter stop-facepermitting the bell-crank 137 to move said lever 134 its full distanceand thereby elevate the ribbon to such a. -p l To insure clearance of.

' of the machine.

in bearings provided in the stra the type-bars from'the platenimmediately after a printing-operation, a yielding-strip 142, such asleather or other suitable material, is strung'across the path of travelof the type-bars, the ends of said strip being connected to postsextendin from the sector-bracket 117 by coil-springs 143. The tension ofthis yielding-strip 1s so adjusted with relation to the coil-springs 119that smudgin Theribon 133 is coiled upon spools 144, and as shown inFigs. 3 and 6, the spools are provided with arbors 145 which are molmtedin bearings v'extending from the strap 122 that also serves as a restfor the type-bars, as previously stated, said strap being secured to theside-standards 1 and 2 The lower ends of the arbors .145 carrybevel-gear Wheels 146 arranged to be alternately engaged by bevelgearWheels 147, which gear-wheels are' secured to a shaft 148 that is alsomounted 122. The

shaft 148 is longitudinall adjustable for the purpose of causing mes in-engagementlv of its bevel-gear Wheels 147 with the bevelT `gear wheels146 of the res y tive ribbonspools, whereb feed of the rlbbon from onespool tothe otler may be reversed, the shaft being held .in adjustmentby means of a spring-contmlled latch 149 which is arranged to engageeither one of a pair of grooves 150 formed in said shaft. y

Motion is vimparted to the yribbon-feed shaft 148, by means of a pawl151, which pawl is provided withva laterally extended facev that engagesthe adjacent bevel-gear wheel 147 yof said shaft. The pawl 151 iscarried by a lever 152 that is fulcrumed to the side-standard 2, asshown in Fig. 3, the

lower end /of which lever is linked to the adjacent arm 97 of theuniversal-bar 96. Thus with leach oscillating -movement of saiduniversal-bar intermittent rotation js imparted to the ribbon-feed`shaft148, by means of the pawl 151, which movement in turn is transmittedthrough the gear-connection with one or the other of the ribbonspools,depending upon which spool at the time is inmeshed engagement with itsrespeive driving gear-wheel carried by said sia y.

In printingi totals, the carrying-mechanism of all the ad ing-sectionsmust first be reset or loaded by the action of the rocker-bar 22, therocker-bar being then locked in its resetting position in such a mannerthat the sector 9 1s free to successively actuate any or all of theadding-sections independent of said carrying-mechanism now locked. Thuswhen a total or footing is to be printed, the sector automatically addsto the, amount indicated upon each adding-Wheel a sum equal to thediii'erence between the amount visible upon each adding-WheelV `and theregistering capacity of each wheel, which capacity would be ten.

v To obtain the reset and locking-movement of the carryin -mechanismincidental to recording a tota a manually'operative totallever 153 isprovided. This. total-lever is fulcrumed to an ea`r extendingrfrom thecross-brace 3 of the machine-frame, the ear being one of those in whichthe rocker-bar- 22 is also fulcrumed. The arm 22* of the rocker-bar isconnected to the total-lever, by a link 154, said link provided with a.

slotted aperture for engagement with a pin that extends from therocker-bar arm 22,

"and as best shown in Fig. 2, the pin is normally seated in that end ofthe slot farthest from said total-lever, whereby when said total-leveris rocked the arm 22l is actuated; and through rocker 22, thebell-cranks 12 of t-he carrying-mechanism are all lifted to reset orload the latter. The slotted connection between the loading-bar 7 9 andarml 22*l perp mits this movement independent of any movement of saidloading-bar. Movement of the total-lever is limited in either directionby suitable sto s extending from the adjacentl standard ci) the frame,and when said total-lever is moved to reset the addingwheelcarrying-mechanism, the aforesaid total-leverV and connected mechanismis locked in this position by a gravity-dog 155, the nose of which dogengages a lug 156 that extends from the total-lever. The dog 155 ispivoted to t e frame-'standard land in assuming its l king-positionrelative to the total-lever drops slightly so as to bring a laterallyextending shoe 157 into the path of travel of the end of the loading-bar79.

VTVhen said loading-bar 79 is actuated by a movement of theuniversal-swing bar 77, incidental to depression of a tabulator-key, theend of the loading-bar will engage said shoe 157 and lift the do fromits locked position in connection wit the lug 156^and thus cause releaseof the total-lever, which 'lever will return to its normal position,

under suitable spring-control. The return movement also permitstherocker-bar 22 to recede from its locked position relative to thebell-crank arms 23 of the adding-section, whereby the severalcarrying-mechanisms are rendered free to act.

In totaling, the operator first actuates the tabulator-key so as tobring the'sector 9 in vertical alinement with the adding-section ofhighest order in the group from which a total is to be Theioperatorinextpulls the total-lever and locks the carrying-mechanism as stated. Now,for example, if the adding-wheels should show a total*k of 900.000.05,the numeral 9 indicated by the last adding-section must be printed, andthis wheel revolved so as to bring its cipher to the visible pointindicating the wheel as being clear. The first or cents wheel of theseries must also be cleared, the numeral 5 being at present visible.

The arrangement for printing a total consists simply in the operatorcopying the amount indicated upon the register-mechanism, and hence ifthe numeral 9 should be copied, the operator must press the 9-key of theadding-levers, which lever should now, in place ofL actuating theaddingwheel nine spaces, as in an item-registration andprinting-operation, actuate gsaid Wheel only one space, in'order toclear saidfwheel and restore the cipher to the visible-line. The

adding-key 5 would next be depressed in order to print this amount,being the last figure in the total, and incidentally this movement mustalso inove the adding-wheel five spaces so as to return the same tozero. This is accomplished through a transposition of the addlngskeygage-plate 90, whereby the lateral osition of the same is shiftedhorizontally om right to left so as to e, bring the barms 91 of theadding-keys into alinement with a second series of notches 158 withwhich the@ gage-plate is provided.

Vface ofthe key-armf91, the secon step, the'last series o yThe firstnotch of this seriesI operates in conjunction with the second adding-keyarm 91 from left to right of the machine the button o which `key isnumerically indi` cated by the igure 2. This irst notch is of a depthequal to onespace from the en agingnotch operating in conjunction with`the third keyarm is of a depth equal to two spaces, and so on thi-ouhout the seriesytlie` notches each progressive y increasing in depthvstep-bynotches 'having aV depth of eight spaces and operate inconjunction with the nine ff key. The series of notches 158 increase indepth in the opposite direction from the first series of notches 93, andthus when the gageplate is shifted, the notches 158 are bron htinregister with the arms 91 of the adding-keys, whereby movement of saidgage-plate is controlled by said keys in the reverse from'the movementpreviously described in lconnection with the series of notches 93, sothat in printing a total 900.000.05, the 9-key being Y epressed to printthe numeral 9, will only move the gage-plate aV suicient distance tocause the ninthl addingsection to, rotate one tenth of 'a revolution,while-the movement of the adding-key arm 91 makes a l full stroke.` Toprint the ciphers intervening betweenV the numerals 9 and 5 yof `the ex-`ample 900.000.05, the cipher-keylwould be depressed. six times, therebeing no movement of the register-sections during this operation, due'tothe fact that the sector Will not engage the same. At the completion ofthe series of depressions of the cipher-key to print the ciphers, vthetoothed sector 9 1 would be alined with' the last or cents adding-wheelmechanism.y The adding-key bearing the indicated numeral would non7 bedepressed, causing said cents-adding Wheel to move iive spaces, it beingunderstood that in the transposition from one set of notches to theotherof the gageplate, that the notches of both series are of equaldepth at vthat point of said gage-plate acted upon by the 5-key arm ofthe -key, due to vthe :tact that this key vWhether being used fortotaling or adding must impart the same movement to the aforesaidgage-plate, whereby tuated five spaces.

- The oscillatory movement of the sector 9 and its carriage is' limitedin atabulating operation by means of a second set of fixed stops 159similar to the fixed stops 94. The stops 159 start from the first orcipher key' from right to'left and are set olii' at diit'erent distancesfrom the upper carriagerail 26, the last stop of the series beingaffixed to the 2-key, and thus the first key of the series (the cipherkey) when depressed will check the carriage 211, after the latter hasoscillatedonly one space, While the second key, which'is indicated bythe numeral 9 will permit saidcarriage to move the registeradding-Wheels are actwo Vspaces and so on, the space of the movef mentbeing variously limited throughout the system. In this manner, if thekey bearing the numeral 2 should be depressed, its stop 159 Wouldunotcheck Jthe oscillatory movement of tlie; carriage until the latter hadrotated a jsucient distance to move the sector 9 a distance of eightSpaces, or4 if the l-key `is depressed, it would rotate anadding-section nine spaces, the movement being reversed bya depressionot the 9-key, which would only rotate an adding-section one space andthus transposition of the move y ment controlling the adding-section isobtained, While the printing or, recording f mechanism Would operate ina similar man-` ner to that described in connection'with anadding-operation. Shift of the gage-plate 90 is accomplished through abell-crank 160, which Vbellcrank is pivoted to the sidestandard 1 and isprovided with pins 161 ,extending from one of its arms for engage mentwith the adjacent link 30, a pair of which, as previously stated, carrythe gageplate 90. The other arm of the bell-crank 160 is connected tothe total-lever, by means of a link 162 having a slotted end forengagement with a "stud A16? that is carried by "sald total lever, theslotted end of the link being provided to permit full throw of theaforesaid total-lever, the last portlon 1of which throw is sutlicient toactuate the is shown in Fig. 1, there being also means in bell-crank160, the stud 163 being, prlor to the completion of the throw of saidlever, in the opposite end of the link-slot from that shown in Fig. 2.Thus with each operation `of the total-lever, shift of the gageplate 90is obtained, it being understood that the links 30 are given aA slighthorizontal movement upon their supporting studs 29 of the carriage-frameand the\studs 31 that extend from the hangers 32.

As shown in Fig. 2 of lthe drawings, the ribbon-movement controlling-bar139 is held in its normal position engaging a pin of the standard bymeans of a coil-spring 161, in which position its stop-face 140 limitsthe movement of the ribbon as before mentioned. The lower end of the bar139 is connected by a rod 165 directly to the total-lever, and when saidtotal-lever is operated the position of said bar is shifted inopposition to the coil-spring 164 vto thus bring the stop face 141 intoposition under the end of the lever 134, whereby the ribbon iselevatedto such relation to the printing-point thatits lower or totaling-coloris lutiliaed.v Thus with each totaling operation the printed record isdisplayed'in a distinct color from that of the items-record. A s soon asthe total-lever is released by the loading-bar 97, due to movement of atabulator-key after a totaling-operation, the said total-lever,` isreturned to its normal positionV/by means of the coil-sprin 134. When'1a tabulator-key is depressed, 1t is essential in the operation ofthemachine, that the same should be actuated the full distance of itsthrow. Hence to prevent a partial depression of a tabulator-key andA itsreturn to normal without performing its flmct-ions, a locking mechanismis connected to the loading-bar 79, whereby the same together with thetabulatorkeys are prevented from prematurely returning to normalposition, which position connection with the loading-bar whereby thelockinglever 1 05 before mentioned I is brought into the path of travelof the depending finger 106 of the universal-bar arm 97, whereby all ofthe adding keys are locked upon an initial movement of the loading-barand held in this lockedxpsosition until the loading-bar completes itsmovement.V

The locking-mechanism consists of a gravlty-pawl 166, which pawl ispivoted to a bracket 167 that depends from the cross- .brace 83. Thenose ofthe pawl is arranged to engage a series of teeth 168 thatprojectfrom the loading-bar, there being a pin 169 extending from thegravity-pawl 166 for engagement with a spring-controlled trigger 17 0,which trigger is also pivoted to the bracket'167. A tail 171 of thegravity-pawl which extends from the oading-bar, and is so spaced fromthe tail 171 of said pawl "that Y it will ,engage the latter" justpriorto completion of the forward movement of said loading-bar. Upon aninitial forward movement of the loading-bar, the pawl 166 engages theteeth 168 of said loading-bar and prevents a reverse movementof thelatter, until its forward stroke has been completed, in which case tli'epin 172 will engage the tail of the dog and lift same from itstooth-engagement with the loading-bar. Simultaneous with this movement,the pin 169 carried by the pawl will be so elevated that thespring-controlled trigger 170 will drop under said pin 169 and therebyhold the pawl ment of the loading-bar, a third pin 17-1. en-

gages the. lower or link-connected arm of the before mentionedlocking-lever 105, whereby said locking-lever is actuated to effect itslocking-engagement in connection with the linger 106 of theuniversal-bar arm 97, and thus all adding-keys are locked until theloading-bar has completed its for,- ward and backward movement.

Referring to Figs. 1, 2, and 11, a mechanism is illustrated whereby,when any adding-key is depressed, the remaining keys of the series arelocked until the depressed adding-key is returned to its normalposition. This mechanism consists of a comb-plate 175 thatis mountedupon a frame cross-brace 176, by means of a pair of'links 177, only oneof which is shown. A coil-spring 178 in connection with one of the linksand a cross-brace 176, serves to hold the colnbplate in its normalposition against a stoppin 179, as best illustrated in Fig. 11. Thecomb-.plate is provided with vertically disposed slots 180, which slotsare normally disposed slightly outof vert-ical alinement with relationto the adding-keys, the latter being provided with extensions 181 whichare adapted to engage said slots. mouths of these comb-slots are`Jinclined obliquelyto t-he body port-ion in such normal relation tothe' key-extensions 181, that when a key is depressed, its extensionwill enter the. oblique slot-mouth and cause a longitu dinal movement ofthe comb-plate, due to engagement of said extension with one oftheoblique walls of-said slot-mouth. Thus when a key is depressed thismovement of the comb-plate will cause ,the obligue mouths of the slotsto pass under and bridge the path of vertical travel of the extensions181 of all other keys of the series and prevent depression of the same.dien the longi- The

